package com.example.tedtalksimproved;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.app.NavUtils;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.MenuItem;

/**
 * An activity representing a single Video detail screen. This activity is only
 * used on handset devices. On tablet-size devices, item details are presented
 * side-by-side with a list of items in a {@link VideoListActivity}.
 * <p>
 * This activity is mostly just a 'shell' activity containing nothing more than
 * a {@link VideoDetailFragment}.
 */
public class VideoDetailActivity extends FragmentActivity {

	/**
     * The number of pages (wizard steps) to show in this demo.
     */
    private static final int NUM_PAGES = 5;

    /**
     * The pager widget, which handles animation and allows swiping horizontally to access previous
     * and next wizard steps.
     */
    private ViewPager mPager;

    /**
     * The pager adapter, which provides the pages to the view pager widget.
     */
    private PagerAdapter mPagerAdapter;
    
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_video_detail);

		// Show the Up button in the action bar.
		getActionBar().setDisplayHomeAsUpEnabled(true);

		// savedInstanceState is non-null when there is fragment state
		// saved from previous configurations of this activity
		// (e.g. when rotating the screen from portrait to landscape).
		// In this case, the fragment will automatically be re-added
		// to its container so we don't need to manually add it.
		// For more information, see the Fragments API guide at:
		//
		// http://developer.android.com/guide/components/fragments.html
		//
		if (savedInstanceState == null) {
			// Create the detail fragment and add it to the activity
			// using a fragment transaction.
			Bundle arguments = new Bundle();
			arguments.putString(VideoDetailFragment.ARG_ITEM_ID, getIntent()
					.getStringExtra(VideoDetailFragment.ARG_ITEM_ID));
			VideoDetailFragment fragment = new VideoDetailFragment();
			fragment.setArguments(arguments);
			getSupportFragmentManager().beginTransaction()
					.add(R.id.video_detail_container, fragment).commit();
		}
		
		 // Instantiate a ViewPager and a PagerAdapter.
       /*
		mPager = (ViewPager) findViewById(R.id.pager);
        mPagerAdapter = new ScreenSlidePagerAdapter(getFragmentManager());
        mPager.setAdapter(mPagerAdapter);
        */
	}
	/*
	 @Override
	    public void onBackPressed() {
	        if (mPager.getCurrentItem() == 0) {
	            // If the user is currently looking at the first step, allow the system to handle the
	            // Back button. This calls finish() on this activity and pops the back stack.
	            super.onBackPressed();
	        } else {
	            // Otherwise, select the previous step.
	            mPager.setCurrentItem(mPager.getCurrentItem() - 1);
	        }
	    }
*/

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case android.R.id.home:
			// This ID represents the Home or Up button. In the case of this
			// activity, the Up button is shown. Use NavUtils to allow users
			// to navigate up one level in the application structure. For
			// more details, see the Navigation pattern on Android Design:
			//
			// http://developer.android.com/design/patterns/navigation.html#up-vs-back
			//
			NavUtils.navigateUpTo(this, new Intent(this,
					VideoListActivity.class));
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
	
	/**
     * A simple pager adapter that represents 5 ScreenSlidePageFragment objects, in
     * sequence.
     */
    private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
    	
        public ScreenSlidePagerAdapter(FragmentManager fragmentManager) {
            super(fragmentManager);
        }

		@Override
        public Fragment getItem(int position) {
            return new VideoDetailFragment();
        }

        @Override
        public int getCount() {
            return NUM_PAGES;
        }
    }
	
}
